What are the functions of vitamin B12?

Patient's question:

Pregnant 16 weeks, prenatal checkup found very low Vitamin B12, only 98

Doctor's answer:

Hello, according to your test results, vitamin B12, iron, and folic acid are all essential nutrients for hematopoiesis. Therefore, if vitamin B12 levels are low, it may lead to megaloblastic anemia, while low ferritin levels can cause iron-deficiency anemia.
Recommendations: The doctor may not have prescribed medication for you because your anemia is still mild and generally does not require treatment. So, there is no need to worry. It is recommended to have regular follow-up tests.